Download PDF by Bertil Aronsson, Torsten Lundström, Ingvar Engström (auth.),: Anisotropy in Single-Crystal Refractory Compounds:

By Bertil Aronsson, Torsten Lundström, Ingvar Engström (auth.), Fred W. Vahldiek, Stanley A. Mersol (eds.)

ISBN-10: 1489953078

ISBN-13: 9781489953070

ISBN-10: 1489953094

ISBN-13: 9781489953094

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Read Online or Download Anisotropy in Single-Crystal Refractory Compounds: Proceedings of an International Symposium on Anisotropy in Single-Crystal Refractory Compounds, held on June 13–15, 1967, in Dayton Ohio. Sponsored by the Ceramics and Branch of the air Force Materials La PDF

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Additional resources for Anisotropy in Single-Crystal Refractory Compounds: Proceedings of an International Symposium on Anisotropy in Single-Crystal Refractory Compounds, held on June 13–15, 1967, in Dayton Ohio. Sponsored by the Ceramics and Branch of the air Force Materials La

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D :. 05 w/o of any impurity element in general) and, as expected, no variation in stoichiometry was detectable. Both as-grown crystals and specimens treated in vacuum at temperatures as low as l600°C exhibited evidence of severe surface 8i loss. The loss of Si resulted in the formation of phases which contained le;3s S1 than that present in WSi 2 . A section through a crystal heated in vacuum to 1700°C exhibited two surface phases (X, Y) in addition to the matrix WSi 2 • Figure 10 shows the relative WLa and SiKa x-ray intensity available from each phase.

From the intersection of these lines with the ordinates n = respective diameters 15 N a 0, one obtains the 44 CRYSTAL STRUCTURE AND CHEMISTRY Table I Paracrystals in AI-promoted ammonia catalysts Annealing - Lattice planes a 15 (R) (R) g (%) a h h h h h 0 0 h 0 1. 24 1. 07 I. 08 1. 02±0. 02 O. 19±0. 02 O. 11±0. 01 h h h h 0 h h 0 0 1. 24 1. 63 O. 15±0. 01 950°C h h h 0 h 0 1. 24 1. 1 400°C 15 h -800°C 20 h of the paracrystalline lattices. 2% for (hhh) are observed and diameters D of 250R. 15 increases to 500R.

Thus, no flayers occur in these borides, as previously suggested for WB 2 and also ReB 2 and Mo 2 BS • The structures of A1B 2 , Ru 2 Ba and WB 2 are illustrated in fig. 5. ARONSSON,T. LUNDSTROM, AND I. C o o q 0 o 0 '- .... 72 A K Fig. 4. Structural elements found in boron-rich borides. 4. If, in the A1B2 structure, one third of the metal atoms is replaced by a pair of boron atoms, the structure proposed for WB 4 is obtained. (The line connecting the boron atoms is parallel to the hexagonal axis.

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Anisotropy in Single-Crystal Refractory Compounds: Proceedings of an International Symposium on Anisotropy in Single-Crystal Refractory Compounds, held on June 13–15, 1967, in Dayton Ohio. Sponsored by the Ceramics and Branch of the air Force Materials La by Bertil Aronsson, Torsten Lundström, Ingvar Engström (auth.), Fred W. Vahldiek, Stanley A. Mersol (eds.)


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